Publication

Recent progress with Diagnostic Neutral Beam Injector at TCV tokamak

Stefano Coda, Basil Duval, Yves Martin, Damien Fasel, Ugo Siravo
2026

Abstract

The present status of operation and upgrades of the 50 keV / 3 A Diagnostic Neutral Beam Injector (DNBI) at TCV tokamak are described. The plasma grid was replaced by a new re-manufactured one with its existing design. The technology and production were performed within SPC-EPFL. The further redesign of the plasma grid was done to improve the strength and stability, accounting for the results of grid deformation measurements, and considering ANSYS thermomechanical analysis in combination with IBSimu beam simulations results. The key parts of the plasma source were re-shaped to increase the DNBI beam pulse duration and the source lifetime. A new power supply set for DNBI was developed after the analysis of a beam current up to 3-3.5 A and extended beam shot duration up to 2-2.5 s. The new multichannel optical diagnostics was recently implemented for the beam spectral measurements.

Official source

https://infoscience.epfl.ch/entities/publication/6109351e-8990-47fd-8e88-e4f0c7189010

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Stefano Coda, Basil Duval, Yves Martin, Damien Fasel, Ugo Siravo
2026

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/6109351e-8990-47fd-8e88-e4f0c7189010

About this result

Related concepts (32)

Tokamak

A tokamak (ˈtoʊkəmæk; токамáк) is a device which uses a powerful magnetic field to confine plasma in the shape of a torus. The tokamak is one of several types of magnetic confinement devices being developed to produce controlled thermonuclear fusion power. , it was the leading candidate for a practical fusion reactor. Tokamaks were initially conceptualized in the 1950s by Soviet physicists Igor Tamm and Andrei Sakharov, inspired by a letter by Oleg Lavrentiev. The first working tokamak was attributed to the work of Natan Yavlinsky on the T-1 in 1958.

Plasma (physics)

Plasma () is one of four fundamental states of matter, characterized by the presence of a significant portion of charged particles in any combination of ions or electrons. It is the most abundant form of ordinary matter in the universe, being mostly associated with stars, including the Sun. Extending to the rarefied intracluster medium and possibly to intergalactic regions, plasma can be artificially generated by heating a neutral gas or subjecting it to a strong electromagnetic field.

Plasma propulsion engine

A plasma propulsion engine is a type of electric propulsion that generates thrust from a quasi-neutral plasma. This is in contrast with ion thruster engines, which generate thrust through extracting an ion current from the plasma source, which is then accelerated to high velocities using grids/anodes. These exist in many forms (see electric propulsion). However, in the scientific literature, the term "plasma thruster" sometimes encompasses thrusters usually designated as "ion engines".

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Recent progress with Diagnostic Neutral Beam Injector at TCV tokamak

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